Pump



` R. D. HUGHES Aug. 17 ,1926.

Pun?

File@ August 5. 19M

MAI'

ATroRNEYs Patented ug. 17, 1926.

UNITED STATES PATENT OFFICE.

ROBERT D. HUGHES, OF LYNCI-IIBURG, VIRGINIA.

PUMP.

Application filed August 5, 1924. Serial No. 730,198.

My invention relates to improvements in pumps, more particularly to hand pumps such as are used for forcing air into an automobile tire, and it consists in the combinations, constructions and arrangements herein described and claimed.

An object of the invention is to provide in a pump of the character described an improved plunger arrangement which is adapted to slide freely in the pump barrel Vand at the same time afford facilities for positively preventing escape of pressure fluid from the cischarge end of the pump barrel'past the plunger to the intake end of the pump barrel.

A further object of the invention is to provide in a pump of the character described an improved and novel means for supplying lubricant to the relatively moving parts of the pump.

A still further object of the invention is to provide a pump of the character described which is strong` and durable, not likely to get out of order easily and thoroughly practical commercially.

Other objects and advantages will be apparent from the following description; considered in conjunction with the accompanying drawings7 in which Figure 1 is a perspective view of a pump equipped with a plunger embodying the invention, the barrel of the pump being partially broken away to disclose the plunger therewithin,

Figure 2 is an enlarged vertical section through a port-ion ofthe pump barrel and through the plunger and a portion of the lunger rod7 another portion of the plunger rod being shown in elevation.

In carrying out the invention, I make use of a pump barrel 1 which is of the usual tubular form and is closed at its upper end by the usual cap 2 having an intake opening therein, as at 3. The barrel 1 is closed at its lower end by a base l which may be adapted in an vordinary manner for attachment to a oor or like supporting surface. Aflexible discharge member 5 is attached at one end to the bases: in the usual manner and communicates with the interior of the barrel 1 at the lower end in any suitable known manner as by means of the usual passage or chamber not shown in the upper lpart of the base.

The parts described so far are ordinary in construction and form no part of my invention except in so far as they cooperate with the parts which Will now be described.

A plunger rod 6 extends slidably through a central opening in the cap 2 and is provided at its upper end with a handle 7. A lplunger embodying the invention includes a tubular core or body 8 having an axial bore 9 merged at its upper end at an appreciable distance from the upper end of the core by a tapering shoulder 10 into a counterbore 11 which is adapted vfor the reception of the lower end portion of the plunger rod 6 and may be connected with the plunger rod through the agency of screw threads which engage with screw threads on the lower end portion of the plunger rod. When the core 8 has beenV placed in threaded engagement with the lower end portion of the plunger stem and has been screwed onto the latter until the lowerv end of the plunger rod abuts the shoulder 10 the core may be held against retrograde movement in respect to the plunger stem by means of a pin 12 which is extended through aligned opposite openings in the lapped portions of' the plunger stem and core and is secured against displacement from said openings in any suitable known manner, as by having the opposite ends thereof upset as at 13.

The lower end portion of the plunger stem is provided with a passage which extends from the lower end of the plunger' stem axially of the latter as at 14 above the level of the upper end of the core 8 and then laterally outward as at 15 to open through the outer wall of the plunger rod.

The bore 9 of the tubular core is merged at its lower end atan appreciable distance above the lower end of the tubular core by a tapering annular shoulder 16 into a counterbore 17. The counterbore 17 serves as a valve chamber andthe tapering annular shoulder 16 serves as a seat for a ball valve 18 which is disposed loosely in the counterbore 17 and is held against falling fromr than that of the bore 9 so that air can pass through the passage 15-14, bore 9 and counterbore 17 when the valve 18 is supported upon the stop- 19 and oil' its seat. llowever7 when the valve has been moved against its seat, the passage of air from the counterbore 17 into the bore 9 will be positively prevented.

The tubular core 8 is reduced in outer diameter for the lower part of its length as indicated at 2O thus delining an annular shoulder 21 at the juncture or" the relatively largel upper end portion and the smaller lower end portion ot the tubular core. A steel washer 22 which is ot slightly less outer diameter than the inner diameter of the barrel 1 is slipped over the lower end ot the tubularl core against the shoulder 21. A cup leather 23 is adapted to be mounted on the lower end portion ot the tubular core against the steel washer 22 and to have a close sliding tit with the inner wall of the barrel 1. A steel washer 24 is mounted on the reduced end portion ot the tubular core within the cup washer 23 for clamping the head of the latter against the washer 22. A spacing collar 25 is slipped on the reduced lower end portion ot the tubular `core 8 against the washer 24 and is held against the latter by a retaining washer 26 which is mounted on the extreme lower end portion or" the tubular core and which is ot slightly less outer diameter than the inner diameter ot the barrel 1. y The outer diameter of, the retaining' washer 26 is greater than the inner diameter ot' the cylindrical body of the cup washer. A filler washer or annular member which is made ot telt or like absorbent ma.

terial and is indicated at 27 is mounted upon the collar 25 and ills the space between the collar 25 and the inner wall of the cylindrical body of the cup washer and between the metal washer 24 and the retaining washer 26. An expander urges the body ot the cup washer continuously outward against the inner wall of the barrel 1, said expander being `formed of an elongated 'flat strip of resilient material arranged within the cylindrical body of the cup leather in a convolution which as indicated at 28 encircles the telt washer 27 and presses radially outward against the body of the cup leather. The felt washer 27 is thoroughly saturated with a suitable lubricant. It ot course is to be understood that the telt washer and the eX- pander 28 are placed in position within the cup leather before the retaining washer 26 is placed on the eXtreme lower end portion ot the core 8. After the felt washer and the spring are in place and the telt washer has been saturated with a suitable lubricant, the retaining washer 26 is placed on the lower end portion of the core 8 and moved upwardly and into position to torce the collar 25l against the clamping washer 24 and the latter against the head of the cup .leather which in turn is pressed against the washer 22. At this time, the retaining washer 28 abuts the lower end of the cylindrical body ot the cup leather and the telt washer and the expander are held against displacement from position within the cylindrical body ot' the cup leather. The retaining washer 26 is held against downward movement from the desired position on the tubular core 8 in any suitable known manner, as by slightly upsetting the tubular core at its lower end as indicated at 29.

From the foregoing description ot' the various parts of the device, the operation thereof will be readily understood. When the plunger is moved upwardly in the barrel 1, the ball valve 18 will rest upon the stop 19 and air will pass from the upper part of the barrel into the space within the barrel below the plunger. When the plunger is 'forced downward in the barrel, the air within the barrel below the plunger will be compressed and the ball valve 18 will move almost coincidently with the beginning ot downward movement of the plunger against the seat 15, after which the flow of air troni the space within the barrel below the plunger to the space within the barrel above the plunger will be entirely prevented and the air within the barrel below the plunger will be forced from the latter through the discharge member 5 when the downward move# ment oi the plunger is continued. A close sliding fit between the plunger and the inner wall ot the barrel is assured since the expander 28 urges the tlexible cylindrical body ot the cup leather-radially outward at all times.' Lubricant will feed from the tiller member 27 to the cup leather and will keep the lat-terV pliable vat all times. Also, the lubricant will gradually escape between the lower end of the cylindrical body of the cup leather and the retaining washer 26'to the inner wall of the barrel so that the relatively moving surfaces ot the plunger and barrel will be kept lubricated. Manitestly, the

plunger will withstand heavy pressure without being impaired and a pump embodying the invention thus is adapted to Ytorce air into an automobile tire until a relatively great pressure within the latter has been reached.

Obviously, my invention is susceptible of embodiment in `forms other than that illustrated in the accompanying drawings and I therefore consider as my own all such modifications and adaptations of the form ot' the device herein described as fairly fall within the scope of the appended claims.

1. In a device of the character described, a plunger comprising a core, a cup leather having a head portion mounted on said core and having a cylindrical portion adapted to CII move in close sliding contact with the inner wall of the barrel, cooperative clamping washers respectively disposed on the core at opposite sides of the head of the cup leather, an absorbent fibrous iiller member surrounding said core within the cup leather and adapted to be saturated with a lubricant, and a retaining washer secured on said core in abutting relation adjacent to its outer edge with the free end or" the cylindrical portion of the cup leather for retaining said absorbent filler member within the cup leather.

2. In a device of the character described, a plunger comprising a core, a cup leather having a head portion mounted on said core and having a cylindrical portion adapted to inove in close sliding contact with the inner wall of the barrel, cooperative clamping washers respectively disposed on the core at opposite sides of the head of the cup leather, an absorbent ibrous iiller member surrounding said core within the cup leather and adapted to be saturated with a lubricant, a retaining washer secured on said core in abutting relation adjacent to its outer edge with the free end of the cylindrical portion of the cup leather for retaining said absorbent iller member within the cup leather, a spring expander encircling said iller mein- 3cr within the cup leather and engaging with the inner wall of the cylindrical portion of the cup leather for urging the latter continuously outward, and a retaining washer secured on the lower end portion of the core and abutting adjacent to its outer edge with the free end of the cylindrical portion of the cup leather for prevening displacement of said absorbent iiller member and said expander from position within the cup leather.

3. In a plunger, a tubular core having a counterbore at the lower end thereof, constituting a valve chamber, and an internal annular shoulder at the upper end of the counterbore constituting a valve seat, said core having alined radial openings located below the plane of said internal shoulder, a stop pin extending across said valve chamber, the ends of said pin being received in said alined openings, a ball valve loosely disposed in the valve chamber between said valve seat and said stop pin, and means surroundingy said tubular core for sealing the space between the case and the inner wall of an encircling barrel and for preventing displacement o'f said stop pin.

4. In a plunger, a tubular core having a counterbore at the lower end thereof, constituting a valve chamber, and an internal annular shoulder at the upper end of theV counterbore constituting a valve seat, said core having alined radial openings located below the plane of said internal shoulder,

a stop pin extending across said valve chainber, the ends of said pin being received in said alined openings, a ball valve loosely disposed in the valve chamber between said valve seat and said stop pin, a collar encircling said core in position to prevent displacement of said stop pin, and means for preventing displacement of said collar and for sealing the space between said core and the inner wall of an encirclino barrel.

R10-BERT D. iUGHEs. 

